I am trying to make a query within 2 tables.
I have one table with id_person and message: (addedEvent) and other table with id_person, names and surnames. (registered)
The problem is that messages can be related to one person (id_person) or to everyone (id_person = 0) so I want to take the name and the surname of every person when needed and not not when not needed. I tried this:
SELECT message,
IF(id_person!= 0,
SELECT name
FROM registered
WHERE addedEvents.id_person= registered.id_person, 0) AS name,
IF(id_person!= 0,
SELECT surname
FROM registered
WHERE addedEvents.id_person= registered.id_person, 0) AS surname
FROM addedEvents
But gives me a syntax error and I don't see it.
Try this:
SELECT message,
IF(
id_person != 0,
(
SELECT name
FROM registered
WHERE addedEvents.id_person = registered.id_person
),
'0'
) AS name,
IF(
id_person != 0,
(
SELECT surname
FROM registered
WHERE addedEvents.id_person = registered.id_person
),
'0'
) AS surname
FROM addedEvents
You can't think of SQL as a regular programming language with flow control structures and the like. And your query does not even seem to need it:
SELECT ae.message, re.name, re.surname
FROM addedEvents ae
LEFT JOIN registered re ON ae.id_person=re.id_person
I think you are trying to select message of a related person in registered.
Try this:
select
r.name, r.surname, e.message
from
addedEvents e, registered r
where
e.id_person = r.id_person
and r.id_person != 0
Related
I have to do a query SQL to search into the table below
Person
Name - Surname - Age
using Name, Surname ad Age as parameter of my query.
Since this query is generated dinamically, may happen that one of this parameters is equal to "" or null. In this case I expect that the behavior obtained is:
If Name = "", I want to search for surname and age regardless of the
name (every name).
I have found a possible solution to this problem and is to use a LIKE statement, in this way:
SELECT * ...
WHERE Surname like '%%' AND Name like '%%' AND Age like '%%'
When I put %% in the like it returns me all records of the table.
Is this correct or there is another way?
SQL offers methods for those issues.
You can easily use (Surname IS NULL OR Name = '' OR ...)
See: https://dev.mysql.com/doc/refman/5.7/en/is-null-optimization.html
Theres also a thread with almost the same question: MySQL syntax checking if parameter is null
...
Where (IsNull(#SurName, '') = '' OR #SurName = t.SurName)
AND (IsNull(#Name, '') = '' OR #Name = t.Name)
AND (IsNull(#Age, '') = '' OR #Age = t.Age)
For sql server it could look something like this:
select *
from t
where (
Surname like '%'+#Surname+'%'
or coalesce(#Surname,'') = ''
)
and (
Name like '%'+#Name+'%'
or coalesce(#Name,'') = ''
)
and (
Age like '%'+#Age+'%'
or coalesce(#Age,'') = ''
)
catch-all queries
Dynamic Search Conditions - Erland Sommarskog
Catch-all queries - Gail Shaw
SELECT * ...
WHERE
IF(NAME IS NULL OR NAME='',Surname LIKE '%%' AND Age LIKE '%%', Surname LIKE '%%' AND NAME LIKE '%%' AND Age LIKE '%%');
I have got an error "ERROR: subquery must return only one column " when I am runing this query:
INSERT INTO details (id, object_id, detail)
(
SELECT
CASE
WHEN (SELECT * FROM details WHERE NOT EXISTS(SELECT 1 FROM main_base WHERE main_base.id = details.id))
THEN
concat(SUBSTRING(main_base.id, '(\d+.\d+.)'), n.counted :: TEXT, 'A')
ELSE
concat( SUBSTRING (main_base.id, '(\d+.\d+.)'), n.counted :: TEXT)
END AS id,
main_base.object_id,
main_base.details
FROM main_base
CROSS JOIN LATERAL
generate_series(1, COALESCE ((string_to_array(main_base.id, '-')) [2] :: INT, 1)) AS n (counted)
WHERE main_base.id LIKE '%-%' AND NOT main_base.details ~ '^\.\d+|\(\.\d+\)'
);
I have not clue what is wrong. I've read some topic that people had the same problem but still dont know how to fix it.
I think the problem is that:
SELECT * FROM details WHERE NOT EXISTS(SELECT 1 FROM main_base WHERE main_base.id = details.id)
Can return more than one row, so causes problems in the WHEN statement. It can return more than one row, as the subquery will return 1 every time the condition is met.
If you want to trigger the case statement based on when there exists some records in this set, could you use:
(SELECT COUNT(*) FROM details WHERE NOT EXISTS(SELECT 1 FROM main_base WHERE main_base.id = details.id)) > 1
I'm migrating a project to Laravel 4 and I am stuck with a quite complex query, which I'd like to migrate into a proper Eloquent query.
I have a table that contains chat messages, called chat_messages with a representing Model Chatmessage
The table contains a sender and a receipient column with a user id linking to the users table and User Model.
The query to get a list with all user IDs of all chat partners in raw SQL on the old version of the application is as follows:
$sql_allChatPartners = "SELECT DISTINCT chatPartner
FROM ( SELECT * FROM (
SELECT cm_receipient AS chatPartner, cm_sent_at
FROM chat_messages WHERE cm_sender = '".$me->userID."'
UNION
SELECT cm_sender AS chatPartner, cm_sent_at
FROM chat_messages WHERE cm_receipient = '".$me->userID."'
) whateva ORDER BY whateva.cm_sent_at DESC ) other";
Sorry for naming the "fake" tables whateva and other :-)
Could anyone put me in the right direction to do this with Eloquent Querybuilder?
It is important that I get the list of chatPartner IDs in the correct order, where the last chat message has been exchanged as first chatPartner. And the chatPartner where longest inactivity was in the chat as last entry.
This is what I got so far in my User Model...
public function allopenchats(){
$asSender = Chatmessage::where('sender', $this->id)->select('receipient as chatPartner, created_at');
$asBoth = Chatmessage::where('receipient', $this->id)->select('sender as chatPartner, created_at')
->union($asSender)->orderBy('created_at', 'desc')->get();
}
I renamed the columns cm_receipient to receipient, cm_sender to sender and sent_at to created_at in the new database for the new version
Your help would be very much appreciated!
You sql may change to:
SELECT IF (cm_receipient = '10', cm_sender, IF (cm_sender = '10',cm_receipient, 'no')) AS chatPartner, cm_sent_at
FROM chat_messages
WHERE cm_receipient = '10' OR cm_sender = '10'
GROUP BY chatPartner
HAVING chatPartner != 'no'
order by cm_sent_at DESC
In orm:
Chatmessage::where('sender','=',$this->id)
->orWhere('receipient','=',$this->id)
->select(DB::raw('IF (receipient = '.$this->id.', sender, IF (sender = '.$this->id.',receipient, 'no' )) AS chatPartner'), 'created_at')
->groupBy('chatPartner')
->having('chatPartner', '!=', 'no')
->orderBy('created_at', 'desc')
->get();
Thanks very much to Vitalik_74, I wouldn't have come that far without him.
Here is now the final query, although its not in ORM, but it is working fine and gives me the result I need.
$result = DB::select("SELECT *
FROM (
SELECT IF( receipient = '".$this->id."', sender, IF( sender = '".$this->id."', receipient, 'no' ) ) AS chatPartner, created_at
FROM chatmessages
WHERE receipient = '".$this->id."'
OR sender = '".$this->id."'
HAVING chatPartner != 'no'
ORDER BY created_at DESC
)whateva
GROUP BY whateva.chatPartner
ORDER BY whateva.created_at DESC");
if there is someone out there who can do this query with the Laravel Query Builder, I would be happy to see it. For now I'll leave it like this.
I am having the following issue:
When I execute the following statement, I get an error for it returning more than one row
INSERT INTO artist
(personid,
musicgenreid,
totallikes)
VALUES ( (SELECT personid
FROM person
WHERE firstname = 'Joe'
AND middlename = ''
AND lastname = 'blow'),
(SELECT musicgenreid
FROM musicgenre
WHERE musicgenreid = 4),
( totallikes = 328374 ) );
I am getting the error on the (select pesonID from person...) statement, and I am trying to use the 'any' keyword to just grab any row, but I cannot seem to get it to work. I have tried just about any permutation I can think of of the current query and 'any', but it does not work. Is there another solution I should be trying or am I just missing the mark for some reason?
It seems you're trying to do something like this:
INSERT INTO artist (personid, musicgenreid, totallikes)
VALUES (
(SELECT personid FROM person
WHERE firstname = 'Joe' AND middlename = '' AND lastname = 'blow'
ORDER BY RAND()
LIMIT 1
),
4,
328374
);
This will get you a random personid that matches the given criteria.
The musicgenreid in your query would be either null or 4. I am forcing it to 4 as it seems that you're manually adding them and you know they already exist.
The total likes field is also fixed but your syntax was incorrect.
try with this sql statement
INSERT INTO artist
(personid,
musicgenreid,
totallikes)
VALUES ( (SELECT personid
FROM person
WHERE firstname = 'Joe'
AND middlename = ''
AND lastname = 'blow' LIMIT 1 ),
4,
328374);
Maybe this is a basic question, but haven't been able to answer it, and would appreciate your help :)
I have the following table in MySQL:
create table anotation
(
chromosome enum
(
'Chr1',
'Chr2',
'Chr3',
'Chr4',
'Chr5',
'ChrC',
'ChrM'
),
version varchar(10),
type enum
(
'CDS',
'chromosome',
'exon',
'five_prime_UTR',
'gene',
'mRNA',
'mRNA_TE_gene',
'miRNA',
'ncRNA',
'protein',
'pseudogene',
'pseudogenic_exon',
'pseudogenic_transcript',
'rRNA',
'snRNA',
'snoRNA',
'tRNA',
'three_prime_UTR',
'transposable_element_gene'
),
strand enum
(
'+',
'-'
),
phase tinyint,
atrributes text
);`
And it has around 600,000 values, and I'm doing the following query:
select distinct
anot_1.chromosome,
anot_1.start,
anot_1.end,
anot_1.atrributes
from
anotation anot_1,
anotation anot_2
where
anot_1.type='CDS'
and
anot_2.type='protein'
and
anot_1.chromosome!='ChrM'
and
anot_1.chromosome!='ChrC'
and
anot_1.chromosome=anot_2.chromosome
and
(
(
anot_2.start=anot_1.start
and
anot_1.end!=anot_2.end
and
anot_2.strand='+'
)
or
(
anot_2.start!=anot_1.start
and
anot_1.end=anot_2.end
and
anot_2.strand='-'
)
);
And in it takes a long while to finish, acutally, but when I do the query (same one, but I drop the one of the conditions from the OR ) it runs almost instantely:
select distinct
anot_1.chromosome,
anot_1.start,
anot_1.end,
anot_1.atrributes
from
anotation anot_1,
anotation anot_2
where
anot_1.type='CDS'
and
anot_2.type='protein'
and
anot_1.chromosome!='ChrM'
and
anot_1.chromosome!='ChrC'
and
anot_1.chromosome=anot_2.chromosome
and
anot_2.start=anot_1.start
and
anot_1.end!=anot_2.end
and
anot_2.strand='+';`
Anyone has any idea of whats happening and if so, how can I solve it?
Thank you!!!
This isn't a solution (and I agree with comments above about indexes), but I have changed your SQL around to use a pair of left outer joins rather than your current SQL which has an OR in the JOIN.
While I don't expect this to be much different in performance it might help you and others see what the query is doing:-
SELECT distinct anot_1.chromosome, anot_1.start, anot_1.end, anot_1.atrributes
FROM anotation anot_1,
LEFT OUTER JOIN anotation anot_2 ON anot_1.chromosome = anot_2.chromosome AND anot_1.start = anot_2.start AND anot_1.end != anot_2.end AND anot_2.strAND = '+' AND anot_2.type='protein'
LEFT OUTER JOIN anotation anot_3 ON anot_1.chromosome = anot_3.chromosome AND anot_1.end = anot_3.end AND anot_1.start != anot_3.start AND anot_3.strAND = '+' AND anot_3.type='protein'
WHERE anot_1.type = 'CDS'
AND anot_1.chromosome != 'ChrM'
AND anot_1.chromosome != 'ChrC'
AND (anot_2.chromosome IS NOT NULL
OR anot_3.chromosome IS NOT NULL)
I'd start by sanitising your query in general, breaking them apart and doing a union
select
CDS.chromosome,
CDS.start,
CDS.end,
CDS.atrributes
from
(
select
a.chromosome,
a.start,
a.end,
a.attribures,
from
anotation a,
where
a.type='CDS'
and
not a.chromosome IN ('ChrM', 'ChrC')
) CDS
join
(
select
a.strand,
from
anotation a,
where
a.type='protien'
) Protien
on
CDS.chromosome = Protien.chromosome
and
CDS.start = Protien.start
and
CDS.end != Protien.end
where
Protien.strand = '+'
union
select
CDS.chromosome,
CDS.start,
CDS.end,
CDS.atrributes
from
(
select
a.chromosome,
a.start,
a.end,
a.attribures,
from
anotation a,
where
a.type='CDS'
and
not a.chromosome IN ('ChrM', 'ChrC')
) CDS
join
(
select
a.strand,
from
anotation a,
where
a.type='protien'
) Protien
on
CDS.chromosome = Protien.chromosome
and
CDS.start != Protien.start
and
CDS.end = Protien.end
where
Protien.strand = '-'